题目

根据短文内容及所给的汉语，写出单词的正确形式，每空限填一词。 Some students dreams of being  1(科学家) , some want to be teachers, and others may want to be doctors. Different people have different kinds of dream jobs. What’s your dream job? Do you want to be an island caretakers? If your answer is yes, here’s a dream job for you. In Scottish, there is an island  2(叫做) Inchcolm. The island is in 3   (需要)of manager. The Scottish  4 (政府)advertises for the job. It offers more than 20,000 for the future manager every year. There aren’t a在MgCl2和AlCl3的混合溶液中，逐滴加入NaOH溶液直至过量．经测定，加入的NaOH的物质的量（mol）和所得沉淀的物质的量（mol）的关系如图所示．则：（1）原溶液中Mg2+、Al3+物质的量浓度之比为______．（2）图中C点表示当加入______molNaOH时，Al3+已经转变为______，Mg2+已经转变为______．（3）图中线段OA：AB=______．